B-12 is there such a thing as too much?

I was wondering if anyone has heard that too much B-12 may cause a problem. Or actually does anyone know what are the implications of having too much B-12. The normal range is up to 1100 mine came back 1440 any ideas?

I would talk to a nutritionist with a doctorate degree. Not all nutrtionists are good about knowing about vitamins. You don't want to overdo B12 because it can get the other levels of vitamins in your system off. Balance is good and a nurtritionist that is GOOD will know about the levels. I give myself a B12 shot once a month for Chronic Fatigue. I am under a doctors care. When I was a vegetarian and VERY ill for years with the CFS, I really used up ALL of my B12 and was barely able to balance and walk. Terrible vertigo too. It is a wonderful vit, but you have to balance everything. Good luck.

From the U.S. Institute of Medicine, the latest (1998) DRI guidelines for vitamin B12 state that there isn't enough evidence of toxicity from excessive B12 intake from foods or supplements. The report goes on to explain why there are no upper limits for B12, which include the GI tract only being able to absorb a small percentage when large doses are ingested, and the weak evidence that although animal studies showed the opposite, excessive B12 intake in humans showed that tumour formation in the colon and liver is inhibited.

Current RDI for adults is 2.4 mcg, though up to 100 mcg a day have been reported with no toxic effects. But even so, chronically excessive amounts of anything should be avoided. Is there a reason why your B12 levels are high? If you take in a lot of dietary B12 and you're worried about adverse effects, you can try to cut down on B12 sources.

Actually I'm a vegeterian, so I'm not quiet sure where my B-12 would be coming from. I don't take any kind of supplement. I just found it odd! I'm going through a confirmation of MS at this point and trying to decipher all the info since my doctor is worth crap!

I'm no expert here but one thing I know....bodybuilders take high amounts of B12 via intramuscular injection....helps with fatigue and increases appetite...from what I understand, B12 supplements taken orally have an extrememly low utilization percentage...whereas injections show remarkable results...

I'm no expert here but one thing I know....bodybuilders take high amounts of B12 via intramuscular injection....helps with fatigue and increases appetite...from what I understand, B12 supplements taken orally have an extrememly low utilization percentage...whereas injections show remarkable results...

I am given b-12 shots once a week to help with energy. I talked to my endocrinologist about having these shots and she said that your body expells any excess b-12 and not to worry about having too much in my system. She said only in rare cases in some diseases it will be high. The b-12 gives me the enrgy to want to get up and exercise. I also drink 1 Red Bull a day, and that has 80% b-12.

After struggling with Chronic fatigue and post surgical fatigue, I tried increasing my B-12 orally only to find out that it is not absorbed well in the intestinal tract. Not too thrilled with the idea of injections and then I found a company that makes a terrific form that is very, very effective. It is a tablet placed under the tongue and is quickly absorbed and I am pleased with the immediate results.

It is 1,000mcg. and includes 400mcg folate, 5mg of B6 and 25mcg of Biotin. It comes in a pleasant cherry flavored tab. I take a capsule form of the other B's at 50 mgs. and a multi vitamin/mineral as well.

I don't think I am allowed to post the company who makes this tablet unfortunately but was formulated by a physician, Alfred F. Libby. Perhaps a search on Google would help using that name.

Solange..I use that too. It is a cherry flavored tablet that is placed under the tounge for 30 seconds and then I swallow it. It is high potency b-12 2500mcg. I am not sure how to translate it into mg.